Not sure what you’re after, but if it’s speed, the 84- 85 cams had more overlap, 20 vs 10 degrees. A commonly cited fact is the 1000’s had the largest cam lift and the most duration 235 degrees, ten degrees overlap. 1100’s were close but earlier closing times, less duration, the same overlap. Both had 38mm intake valves and 32 mm exhaust valves. A little known fact is that that the 1200, despite having significantly less cam lift, had almost the same intake valve lift and more exhaust valve lift due to different rocker arm ratios. They are hidden under the adjusters. It had 36mm intake valves and also 32 mm exhaust valves. It also has near maintenance free valves using hydraulic adjusters, different than automotive styles.
Transmissions can be swapped partially 1100 to 1000, but I don’t think the 1200’s will swap.
Gearing of the transmissions were very similar along the way. The first gear numbers switched and the fifth gear numbers switched a little, but you have to see them with changes to the secondary gearing and the final drive ratios. That’s where the money is.
Here’s a chart, it can be found at classicgoldwings.com but is layered a bit to get there. I’ll include a link. So trust me, 75-79 were all the same and 86-87 were the same as 85, but not 83-84. Scroll down to 1.708 which is your primary reduction, below that is secondary reduction which does flip/flop a little, then first through fifth gears, then final drive ratios.
The other variable is tire size, 1000’s were 17” with a 2.5” rim. The Lester rim for 1000’s was 16” and 18” both 3” rims. 1100’s were 17 inch 2.5” rims I. 80-81 and 16” 82-83 with 3” rim. 84-87 were 15”, with a 3” rim. You can easily adapt a 1500 final drive to a 1200 swingarm and have a 16” with a 3.5” rim.
It’s fairly easy to adapt an 1100 swingarm to a 1000 frame, adds 2–1/2” ?? of length.
Quick and easy drop-in swap is an 85-87 motor to a 75-79 frame, or to an 80-83 frame. You need to swap the output shaft to hook up to either a 1000 or 1100 because they use a circlip to hold the drive shaft on. You need to keep the black box ignition from the 1200. The 84 will go in an 1100 easily.
Either way you just lowered the gearing a bit, 2.83 to 3:1 in 1100 and a lot if you put it into the 1000, 2.83 to 3.4. That’s where it shines in the “Oldwings.” They really needed six gears to be a performance bike. (Can’t be done) Lowering the gearing gives up a little top end and mpg, but makes it responsive. Heck, it maybe doesn’t give up any top end.
The other mod in recent years has been to notch the pistons of a 1200 and put 1000 75-77 heads and cams on. 75-77 had more lift than 78-79. This gives it a bigger intake valve 38mm vs 36mm and bigger ports. 1.4” to 1.25” roughly. I’m not convinced it’s better. I had one for a couple years, went to the stock 85 heads and I think it’s better, but different. Doesn’t rev as high with power, but seems to make more torque down low. So shift sooner. With 1000 heads and cams it pulls hard above redline of the 1200.
I’m sure I’m forgetting things, but this is a brief run down of what’s been done. Too my knowledge, no one has dyno’d any results and only one has taken it to the strip and reported back. That was Oldboy, who put 1000 cams into an 1100, put the lowest first gear in and put a 3.7:1 gear in the final drive. He did a lot of work and barely made it in the high 12’s. Two drivers.
One other suggestion if you drop in the bigger motor is to change front ends. The 1000 was set up on string bean forks. Scary above 90 mph. All 1000/1100/1200 triple trees are interchangeable bearing wise. They bolt right in. Stops have to be altered. 1000’s have 37 mm forks, 1100’s have 39mm forks and 1200’s had 41mm forks. Dozens have adapted different forks to the bikes using AllBalls racing for bearings.
NGWClub is somewhat friendly to altering these bikes as is Classic and this site. You’ll always get asked why. The answer is always the same: because we can, and because we want to.
Here’s the link if my pic is fuzzy: http://filipi.com/wingdifferences.xls
If you still can’t see it, I can provide you with the steps to get there.
Good luck, take pics and share your progress. One thing you’ll find is these are MUCH cheaper than BMW’s.